Memory Game The Endocrine SystemOnline version Review the organs of the endocrine system and their functions. by Kathy Dilliplane Regulates the female reproductive system Helps the immune system recognize and fight pathogens Regulate the male reproductive system Thymus Produces melatonin to regulate sleep cycles Thyroid Increase heart rate during a "Fight or Flight" response Pineal Gland Regulates growth and metabolism Regulates calcium levels in the blood. Ovaries The body's "Master Gland" that controls the other endocrine organs. Pancreas Regulates blood sugar levels Testes Pituitary Parathyroid Glands Adrenal Glands